Same problem with my girlfriends phone it just went dark. I tried the volume down and power button restart and I heard the phone turn on and all of the notifications but still no display. So I called her phone to make sure it was still able to accept phone calls. I answered the call and pressed the power button and the phone display came back on. I don't know if it will work with everyone else's phone but it worked for hers. Hope this helps.
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